One of the biggest drawbacks of Windows Media Player is that it can not load external subtitles. It is an annoying oversight that has not been corrected to date.
And so most users when they have a movie with external subtitles, usually use third-party media players such as VLC player or KMPlayer and so on to load subtitles.
Although Microsoft has not yet rectified it, it has introduced and incorporated into the Windows 10 a new media player application called "Movies & TV" (Movies & TV for those with an English background) that supports uploading external subtitles.
Below you will find how to upload an external subtitle file to "Movies & TV" for Windows 10.
Download the subtitles for the movie or TV show you want to watch. You can save the file anywhere you want on your hard drive, but make sure it is in SRT format. If you have downloaded the subtitles in a compressed file, be sure to unpack it first.
Run the video in the Movies and TV application and press the square button with the two horizontal lines inside it next to the "Play" button. You will see a submenu titled "Select subtitle file". Click on it and it will logically open an explorer window with your computer disks. Navigate to the point where you have saved the subtitles, highlight the SRT file you are interested in and click the "Open" button. Subtitles will start appearing on your screen immediately.